CPP Online Quiz or C++ Online Quiz, CPP MCQ Quiz and Online Test

1 .

Which is the correct statement about operator overloading in C++?

A)

Precedence of operators are changed after overlaoding

B)

Associativity and precedence of operators does not change

C)

Only arithmetic operators can be overloaded

D)

Only non-arithmetic operators can be overloaded

Correct Answer : Option (B) : Associativity and precedence of operators does not change

Explanation : Both arithmetic and non-arithmetic operators can be overloaded. The precedence and associativity of operators remains the same after and before operator overloading.

2 .

Which header file is used to declare the complex number?

A)

complex number

B)

complexnum

C)

complexarg

D)

complex

Correct Answer : Option (D) : complex

Explanation : <complex> header file is used for declaring a complex number in C++.

3 .

What will be the output of the following C++ code?

    #include <iostream>
    #include <complex>
    using namespace std;
    int main ()
    {
        complex<double> mycomplex (20.0, 2.0);
        cout << imag(mycomplex) << endl;
        return 0;
    }

A)

2

B)

20

C)

30

D)

40

Correct Answer : Option (A) : 2

Explaination :

imag part will return the imaginary part of the complex number.

Outpu t:

$ g++ comp5.cpp
$ a.out
2

4 .

Why we use the â€œdynamic_castâ€ type conversion?

A)

it is used for storage

B)

result of the type conversion is a valid

C)

result of the type conversion is an invalid

D)

to be used in low memory

Correct Answer : Option (B) : result of the type conversion is a valid

Explanation : It is used to check that operators and operands are compatible after conversion.

5 .

How to store the large objects in c++ if it extends its allocated memory?

A)

Stack

B)

Queue

C)

Stack & Queue

D)

memory heap

Correct Answer : Option (C) : Memory heap

Explanation : Memory heap will store the large objects in c++ if it extends its allocated memory.

6 .

When we are using heap operations what do we need to do to save the memory?

A)

delete the objects after processing

B)

rename the objects

C)

both rename & delete the objects

D)

add the objects

Correct Answer : Option (A) : delete the objects after processing

Explanation : When you allocate memory from the heap, you must remember to clean up objects when you’re done! Failure to do so is called a memory leak.

7 .

Which container in c++ will take large objects?

A)

vector

B)

string

C)

class

D)

string & class

Correct Answer : Option (A) : vector

Explanation : Because the vector is mainly used to store large objects for the game programming and other operations etc.

8 .

Which is used to pass the large objects in c++?

A)

pass by value

B)

pass by reference

C)

pass by name

D)

both pass by value & reference

Correct Answer : Option (B) : pass by reference

Explanation : Because by using pass by reference we need to pass only address location, So it can save a lot of memory.

9 .

How to unlimit the size of the stack?

A)

setflimit()

B)

unlimit()

C)

setrlimit()

D)

both setrlimit() & unlimit()

Correct Answer : Option (C) : setrlimit()

Explanation : setrlimit() is used to unlimit the size of the stack.

10 .

In which direction does the assignment operation will take place?

A)

top to bottom

B)

bottom to top

C)

left to right

D)

right to left

Correct Answer : Option (D) : right to left

Explanation : In assignment operation, the flow of execution will be from right to left only.